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Surface-treated galvanized steel sheet with superior flat-portion corrosion resistance, blackening resistance, and appearance and corrosion resistance after press forming and aqueous surface-treatment liquid for galvanized steel sheet
Surface-treated galvanized steel sheet with superior flat-portion corrosion resistance, blackening resistance, and appearance and corrosion resistance after press forming and aqueous surface-treatment liquid for galvanized steel sheet
An aqueous surface-treatment liquid is a treatment liquid containing a water-soluble zirconium compound, water-dispersive particulate silica, a silane coupling agent, a vanadic acid compound, a phosphoric acid compound, a nickel compound, and an acrylic resin emulsion in particular proportions. A surface-treated galvanized steel sheet produced using the treatment liquid is a galvanized steel sheet having a surface-treatment coating on a surface thereof, and the coating contains a zirconium compound, particulate silica, a silane-coupling-agent-derived component, a vanadic acid compound, a phosphoric acid compound, a nickel compound, and an acrylic resin in particular proportions. The amount of coating on a zirconium basis is 10 to 200 mg/m2. This surface-treated galvanized steel sheet is chromate-free and has superior flat-portion corrosion resistance, blackening resistance, and appearance and corrosion resistance after press forming.
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机译:水性表面处理液是特别包含水溶性锆化合物,水分散性粒状二氧化硅,硅烷偶联剂,钒酸化合物,磷酸化合物,镍化合物,以及丙烯酸树脂乳液的处理液。比例。使用该处理液制造的经表面处理的镀锌钢板是在其表面具有表面处理被膜的镀锌钢板,该被膜含有锆化合物,二氧化硅微粒,硅烷偶联剂衍生成分,碳纳米管,钒酸化合物,磷酸化合物,镍化合物和丙烯酸树脂以特定比例混合。锆的涂层量为10至200 mg / m 2 Sup>。这种经表面处理的镀锌钢板不含铬酸盐,在压制成形后具有优异的抗平板腐蚀性,抗发黑性和外观和耐蚀性。
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